#pragma once
#include<iostream>
#include<cstring>
#include<string>
#include<sys/types.h>
#include<sys/socket.h>
#include<jsoncpp/json/json.h>

#define SEP " "
#define SEP_LEN strlen(SEP) //不敢使用sizeof
#define LINE_SEP "\r\n"
#define LINE_SEP_LEN strlen(LINE_SEP)

enum
{
    OK = 0,
    DIV_ZERO,
    MOD_ZERO,
    OP_ERROR
};

const std::string &enLength(const std::string &text)
{
    std::string send_string = std::to_string(text.size());
    send_string += LINE_SEP;
    send_string += text;
    send_string += LINE_SEP;

    return send_string;
}

bool deLength(const std::string &package, std::string* text)
{
    auto pos = package.find(LINE_SEP);
    if (pos == std::string::npos)
        return false;
    std::string text_len_string = package.substr(0, pos);
    int text_len = std::stoi(text_len_string);
    *text = package.substr(pos + LINE_SEP_LEN, text_len);
    return true;
}

// 没有人规定我们网络通信的时候，只能有一种协议！！
// 我们怎么让系统知道我们用的是哪一种协议呢？？
// "content_len"\r\n"协议编号"\r\n"x op y"\r\n

class Request
{
public:
    Request(): x(0), y(0), op(0)
    {}
    Request(int x_, int y_, char op_):x(x_), y(y_), op(op_)
    {};
    // 1. 自己写
    // 2. 用现成的

    bool serialize(std::string *out)
    {
#ifdef MYSELF
        *out = "";
        //结构化 -> "x op y\r\n";
        std::string x_string = std::to_string(x);
        std::string y_string = std::to_string(y);
        *out = x_string;
        *out += SEP;
        *out += op;
        *out += SEP;
        *out += y_string;
        *out += LINE_SEP;
#else
        Json::Value root;
        root["first"] = x;
        root["second"] = y;
        root["oper"] = op;

        Json::FastWriter writer;
        //Json::StyledWriter writer;
        *out = writer.write(root);
#endif
        return true;
    };
    // "x op y\r\n"
    bool deserialize(const std::string &in)
    {
#ifdef MYSELF
        // "x op y\r\n" -> 结构化
        auto left = in.find(SEP);
        auto right = in.rfind(SEP);
        if(left == std::string::npos || right == std::string::npos) 
            return false;
        if(left == right) 
            return false;
        if(right - (left+SEP_LEN) != 1) 
            return false;

        std::string x_string = in.substr(0, left);
        std::string y_string = in.substr(right+SEP_LEN);
        if(x_string.empty() || y_string.empty()) 
            return false;
        x = std::stoi(x_string);
        y = std::stoi(y_string);
        op = in[left+SEP_LEN];
#else 
        Json::Value root;
        Json::Reader reader;
        reader.parse(in, root);

        x = root["first"].asInt();
        y = root["second"].asInt();
        op = root["oper"].asInt();
#endif  
        return true;
    
    };

public:
    int x;
    int y;
    char op;
};
class Response
{
public:
    Response():exitcode(0),result(0)
    {}
    bool serialize(std::string *out)
    {
#ifdef MYSELF
        *out = "";
        std::string ec_string = std::to_string(exitcode);
        std::string res_string = std::to_string(result);

        *out = ec_string;
        *out += SEP;
        *out += res_string;
#else
        Json::Value root;
        root["exitcode"] = exitcode;
        root["result"] = result;

        Json::FastWriter writer;
        *out = writer.write(root);
#endif 
        return true;
    };

    bool deserialize(const std::string &in)
    {
#ifdef MYSELF
        // "exitcode result"
        auto mid = in.find(SEP);
        if (mid == std::string::npos)
            return false;
        std::string ec_string = in.substr(0, mid);
        std::string res_string = in.substr(mid + SEP_LEN);
        if (ec_string.empty() || res_string.empty())
            return false;

        exitcode = std::stoi(ec_string);
        result = std::stoi(res_string);
#else
        Json::Value root;
        Json::Reader reader;
        reader.parse(in, root);
        
        exitcode = root["exitcode"].asInt();
        result = root["result"].asInt();
#endif
        return true;
    }
public:
    int exitcode; //0:计算成功，！0表示计算失败，具体是多少,定好标准
    int result; //计算结果
};

bool recvPackage(int sock, std::string &inbuffer, std::string *text)
{
    char buffer[1024];
    while (true)
    {
        ssize_t n = recv(sock, buffer, sizeof(buffer) - 1, 0);
        if (n > 0)
        {
            buffer[n] = 0;
            inbuffer += buffer;
            // 分析处理
            auto pos = inbuffer.find(LINE_SEP);
            if (pos == std::string::npos)
                continue;
            std::string text_len_string = inbuffer.substr(0, pos);
            int text_len = std::stoi(text_len_string);
            int total_len = text_len_string.size() + 2 * LINE_SEP_LEN + text_len;
            // text_len_string + "\r\n" + text + "\r\n" <= inbuffer.size();
            std::cout << "处理前#inbuffer: \n" << inbuffer << std::endl;

            if (inbuffer.size() < total_len)
            {
                std::cout << "你输入的消息，没有严格遵守我们的协议，正在等待后续的内容, continue" << std::endl;
                continue;
            }

            // 至少有一个完整的报文
            *text = inbuffer.substr(0, total_len);
            inbuffer.erase(0, total_len);

            std::cout << "处理后#inbuffer:\n " << inbuffer << std::endl;

            break;
        }
        else
            return false;
    }
    return true;
}